In the process of quoting for a rewire of a large 5 bed occupied house.
If I get the work I'd like to get a friend who's been made redundant to help me for the full duration of the job; humping furniture, lifting floors, routing cables etc.. He's not an electrician but is very practical .

Is this cash in hand or taxable?
Will there be any overtime allowance or flat rate all times all days?
Is your friend getting other "benefits"
How will he get to site and back (will this cost him?)
What have you costed in for the helper or what can the job afford.

Take all above into consideration and agree a figure with your "mate" that suits you both, nothing worse than loosing a hand half way through or working with an unhappy chap.